<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>

    </title>
   <style>
       h1{
           text-shadow: -20px 0 20px rebeccapurple;
       }

   </style>
</head>
<body>
    <h1>测试标题</h1>
</body>
</html>